Gummed paper product



Oct. 20, 1936.

F. w. HUMPHNER:

GUMMED PAPER PRODUCT Filed May 21, 1954 Patented Oct. 20, 1936 UNITED STATES.

PATENT OFFICEH GUMMED PAPER PRODUCT Ferdinand W. Humphner, Oak Park, Ill.

Application May 21, 1934, Serial No. 726,796

. 3 Claims. (01. 9168) This invention relates to gummed paper products, and more particularly to paper strips provided on one side with re-moistening adhesive.

An object of the invention is to provide gummed paper strips of increased flexibility and superior adhesive qualities and, at the same time, of reduced cost. Other specific objects and advantages will appear as the specification pro ceeds.

The invention is illustrated, in a preferred embodiment, by the accompanying drawing, in which the figure is a broken perspective view of an adhesive strip embodying my invention.

For a number of years, attempts have been made to increase the flexibility of the paper base and to reduce the cost of the adhesives used in re-moistening gummed products by mixing or blending different types of adhesives. While, in some instances, the cost of adhesive has been reduced, the blending or mixing has resulted in an inferior adhesive. Frequently, it has been the practice to add a vegetable gum to an animal glue in varying proportions, dependingupon the results desired and the cost of the finished mixture. The blend or mixture has invariably resulted in an impairment of the adhesive properties of the ingredients. Because of the colloidal nature of glue, it is not possible to divide its structure to a sufilciently fine state to give a thorough mixture of the two ingredients so that their values are properly balanced. 'One explanation is that the colloidal parts of the glue become surrounded with the film of dextrine so that it is necessary to first bring the dextrine in solution before the glue is brought into action. Because of the solubility of the dextrine, the

bonding power of the glue is not properly disgrade adhesives can be satisfactorily employed withthe adhesive quality of the finished product equal to that of the high grade adhesive while, at the same time, rendering the paper base more flexible. This is accomplished by first coating the base, as for example. kraft paper, etc. with a thin film of inexpensive adhesive such -s tapioca dextrinc mixed with equal parts c! water, starch coatings, flour, casein. a blend of low grade animal glue with a selection of vegetable gums, etc. The material is applied by any tuitable method as, for example. the roller transier method. doctor blade, spray means, etc., s. as to iorm a thin film on the base, the thin film being uniformly applied to cover all voids or slight curvatures on the surface of the paper. The first coat or sub-stratum of vegetable adhesives etc. dries very quickly and a thin coating of superior adhesive is then placed on top of the first coating and dried to a condition in which it will not adhere to the succeeding convolutions of paper when wound in a roll. I prefer to use animal glue for the top layer of adhesive.

The method just described increases the speed of the gumming operation because the two thin films dry much more rapidly and more uniformly than would one coating equal in depth to the two films. The product is superior in that the solubility properties of the glue are utilized to their full value before moisture reaches the dextrine sub-stratum. The glue coating receives the 15 moisture first and develops to the solubility stage with considerable strength, and any moisture in excess of the desired solubility stage is then passed to the dextrine sub-stratum which, by

its nature, becomes more soluble and acts as a carrier for the moisture in passing the moisture into the paper to render it, as well as the substratum, more flexible. The method results in maintaining the vegetable adhesive. which is less brittle and rigid than the glue adhesive, in direct contact with the paper so as to increase its fiexibility while the glue layer is supported on the "exterior surface of the gummed layer where its adhesive properties can be utilized in full.

In the illustration given in the drawing. A designates the base-of paper; B, the first coating or sub-stratum of low grade adhesive and C, the

superior grade of adhesive such as glue.

While in the foregoing description. I have specified, for the purpose of illustration, specific types of adhesive, it will be understood that such adhesives may be-varied in type and kind in a number of respects without departing from the spirit of my invention.

I claim: I

l. A remoistening tape of the character set forth comprising: a paper strip. a water-pervious layer of adhesive consisting mainly of vegetable adhesive covering said paper and a layer oi water soluble animal glue covering said first mentioned adhesive layer.

2. A remoistening tape of the character set forth comprising: A paper strip. a water-perviens layer of vegetable adhesive covering said paper. and a layer of water soluble animal glue extending over said first mentioned layer.

3. A remoistenlng tape of the character set forth comprising: a paper strip. a layer ofdextrine adhesive covering said paper, and a layer of animal glue extending over said dex'trine adhesive.

FERDINAND W. HUMPHNER. 

